Well-drilling tool



Dec. 19, 1922. 1,439,224.

c. L. BRADFORD.

WELL DRILLING TOOL.

FILED OCT-H.192]- tools and recoupling the series.

mary ob ect of my invention 1s to provide etented Tiles. l9, 1922.

than

. onaianns L. snanronn, or SALT LAKE CITY, UTAH."

.lwnnrsnnrnnrne soon i Application ril d ember 11, 1e'2i. se 'ia1No. 507,066.

To efZ i-nwmm it may concern j v life it known that I, Q i n nes L. Bne 'nronn, a citizen of the United titates, residing at Salt Lake City. in the county of Salt and State of Utah; have invented certain new and useful vImproven'ients in lVelL Drilling Tools. specification. i

It is customaryin well drilling to employ what is called a string of tools, the several tools or members of the string being con.- nected by screw-threaded joints. These joints are fairly secure but it often happens that the joints break or'work loose while the string is in a well and considerable loss or" time and labor is involved in recovering the The primeans whereby the joints are strengthened and prevented from working loose. It s customary to connect the, tools or stringmembers by tapered screwthreadedparts v I opposite direction to the threads on the member a, so that if the member. a tends'to 0 fitting correspondingly tapered and thread ed sockets in ad acentmembers.

According to my invention I employ the tapered members and tapered sockets as heretofore, but I add to each tapered member a plain or unthreaded extension which closely fits a socket extending beyond the threaded socket and T'also prolong such ex-v tension into a recessin' the coupling and p10- ride it with a nut which engages the threaded end of the extension. The threads on the extension are disposed in an opposite direction from those on the tapered threaded member so that should the tapered-member tend to turn in itssocket in one direction it will be prevented from doing so by the nut which is thereby tightened in the recess and holds the parts from movement. I may also employ a set screw which extends through the box or coupling andengages the exten sion of the threaded member. My improvements are shown in the accompanying drawings, in which,

Figure l is a sectional view of portions of drilling tools with I my improvements applied;

Figure 2 is a transverse section on the line 2-2 of Fig. 1; I I

Figure 3 is a view similar to Fig. 1, but showing certain modifications s Figure 4 shows a section on the line 44: of Fig. 3; j Figure 5 is a detail view of a form of nut that maybe employed.

of which the following is a .is applied.

. In the drawingslhave shown'portions oftwo tools or string members A and B,

construeted. inaccordance with my invention. The tool or stringsection A 15 formed with ata ered threaded member a havin 2 I a :9 a plain or unthreaded extension 0 The section B is tormed with a tapered soeket'b;

which corresponds in sizeand shape with.

the. member a, and is correspondingly threaded. Said member. is also formed with a plainsocket extension 5 to receive the extenslona" of the tool A. The extension a fits accurately the socket 2'), as shown in the drawingsx' Bythis construction strain is taken from the threaded member a, and it is prevented from being bent, twisted or moved out of place. The outer end of the extension at isthreaded and extends into. a recess C, in-the where it, engages a nut D, contained .in said recess, The threads on the extension a which receive the nut are disposed in an turn, this turning movement will be resisted.

The recess C may extend entirely through the coupling or part-way through, as shown. This opening is preferably formed by punching the member B and swaging it so driven home the threaded end of thememher a ,will engage the nut. Preferably a spring washer E is interposed between the nut and the. adjacent Wall of the recess. This tends to hold the nut firmlyin place.

The nut Dmay be operated by a Wrench or other suitable tool and I may employ a nut such as is shown in Figure 5 which is formed with projections by means of which the nut may be turned when a suitable tool I-may also employ a set screw F of the kind illustrated. This set screw is set into a suitable threaded recess in the member-B so as not to'project therefrom and its inner end'is preferably recessed or cupped as 110 shown to provide edges] or an edge WhlCh v engages the extension a; The set screw may member B, 75

at the joints and 90 5k tension.

he used in conjunction with the separately.

I claim as my invention '1. A coupling for drillingtools comprisvnut I ing a section having a tepered member threaded in one plain oylindiiczil en end threaded in the, other direction, a second section having a tapered threaded direction and hmring it nut threaded on the threaded end of the ex- A coupling for, drilling tools compris- O I e 154:3 4

extension terminating in ,ing a seetion hm ing a tapered member threaded in one dii'eetion and. having a plain oyllndi'lczii extension ternnnaiing. 111 an end threaded in the othei' direction, a; second seetionha'vinge tapered threaded socket to recelve the tapered inenlbei'; a cylindrical socket" in which the cyiindr ieal extension closely end an enlai'ged socket opening to the outside of the section, a nut threedml on the threaded end of the erfieneiom and additional means 3 331QDIQVEEIflflDg 'elatii'e turnlng or longitudinal movement hetween the two sections,

Intestimony whereof I have i'iere mto 30 subscribed my name. q

' 3 CHARLES L. BRADFUREL 

